Panoramic lens assembly

Abstract

A panoramic lens assembly includes a first lens assembly which includes a first lens group, a first prism and a second lens group, all of which are arranged in order from a first object side to a first image side along a first optical axis. The first lens group is with negative refractive power and includes a first and a second lens. The first prism includes a first incident surface, a first reflective surface and a first exit surface. The second lens group is with positive refractive power and includes a third, a fourth, a fifth, a sixth and a seventh lens. The first lens assembly satisfies: 0.2≤TTL 1 /θ 1m ≤0.4, wherein TTL 1 is an interval in mm from an object surface of the first lens to a first image plane along the first optical axis and θ 1m is a half maximum field of view in degree for the first lens assembly.

What is claimed is: 
     
       1. A panoramic lens assembly, comprising a first lens assembly, wherein:
 the first lens assembly comprises a first lens group, a first prism and a second lens group, all of which are arranged in order from a first object side to a first image side along a first optical axis, wherein: 
 the first lens group is with negative refractive power and comprises a first lens with negative refractive power and a second lens with negative refractive power, all of which are arranged in order from the first object side to the first image side along the first optical axis; 
 the first prism comprises a first incident surface, a first reflective surface and a first exit surface, wherein the first incident surface faces an image side surface of the second lens; 
 the second lens group is with positive refractive power and comprises a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, all of which are arranged in order from the first object side to the first image side along the first optical axis, wherein an object side surface of the third lens faces the first exit surface of the first prism and a refractive power of the third lens is opposite to a refractive power of the fifth lens; and 
 the first lens assembly satisfies: 0.2≤TTL 1 /θ 1m ≤0.4, wherein TTL 1  is an interval in mm from an object surface of the first lens to a first image plane along the first optical axis and θ 1m  is a half maximum field of view in degree for the first lens assembly. 
 
     
     
       2. The panoramic lens assembly as claimed in  claim 1 , wherein the seventh lens is an aspheric lens and a sign of the refractive power of the third, fourth, fifth, sixth and seventh lens is positive, positive, negative, positive and positive. 
     
     
       3. The panoramic lens assembly as claimed in  claim 1 , wherein the first lens assembly satisfies:
   −4≤ f   1   /R   12 ≤−0.667,
 
 wherein f 1  is an effective focal length of the first lens and R 12  is a radius of curvature of an image side surface of the first lens. 
 
     
     
       4. The panoramic lens assembly as claimed in  claim 1 , wherein the first lens assembly satisfies:
   4≤ ER   11   /f   f ≤8,
 
 wherein ER 11  is an effective radius of an object side surface of the first lens and f f  is an effective focal length of the first lens assembly. 
 
     
     
       5. The panoramic lens assembly as claimed in  claim 1 , wherein the first lens assembly further comprises a stop disposed between the third lens and the fourth lens. 
     
     
       6. The panoramic lens assembly as claimed in  claim 1 , further comprising a second lens assembly, wherein the second lens assembly comprises a third lens group, a second prism and a fourth lens group, all of which are arranged in order from a second object side to a second image side along a second optical axis, wherein:
 the third lens group is with negative refractive power and comprises an eighth lens with negative refractive power and a ninth lens with negative refractive power, all of which are arranged in order from the second object side to the second image side along the second optical axis; 
 the second prism comprises a second incident surface, a second reflective surface and a second exit surface, wherein the second incident surface faces an image side surface of the ninth lens; 
 the fourth lens group is with positive refractive power and comprises a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens, all of which are arranged in order from the second object side to the second image side along the second optical axis, wherein an object side surface of the tenth lens faces the second exit surface of the second prism and a refractive power of the tenth lens is opposite to a refractive power of the twelfth lens; and 
 the first object side and the second object side are opposite to each other, the first image side and the second image side are opposite to each other. 
 
     
     
       7. The panoramic lens assembly as claimed in  claim 6 , wherein the second lens assembly satisfies:
   0.2≤ TTL   2 /θ 2m ≤0.4,
 
   37≤ Vd   10   −Vd   12 ≤50,
 
 wherein TTL 2  is an interval in mm from an object surface of the eighth lens to a second image plane along the second optical axis, θ 2m  is a half maximum field of view in degree for the second lens assembly, Vd 10  is an Abbe number of the tenth lens and Vd 12  is an Abbe number of the twelfth lens. 
 
     
     
       8. The panoramic lens assembly as claimed in  claim 6 , wherein the second lens assembly satisfies:
   −4≤ f   8   /R   82 ≤−0.667,
 
   4≤ ER   81   /f   s ≤8,
 
 wherein f 8  is an effective focal length of the eighth lens and R 82  is a radius of curvature of an image side surface of the eighth lens, ER 81  is an effective radius of an object side surface of the eighth lens and f s  is an effective focal length of the second lens assembly. 
 
     
     
       9. The panoramic lens assembly as claimed in  claim 6 , wherein the fourteenth lens is an aspheric lens and a sign of the refractive power of the tenth, eleventh, twelfth, thirteenth and fourteenth lens is positive, positive, negative, positive and positive. 
     
     
       10. The panoramic lens assembly as claimed in  claim 6 , wherein the second lens assembly further comprises a stop disposed between the tenth lens and the eleventh lens. 
     
     
       11. A panoramic lens assembly, comprising a first lens assembly, wherein:
 the first lens assembly comprises a first lens group, a first prism and a second lens group, all of which are arranged in order from a first object side to a first image side along a first optical axis, wherein: 
 the first lens group is with negative refractive power and comprises a first lens with negative refractive power and a second lens with negative refractive power, all of which are arranged in order from the first object side to the first image side along the first optical axis; 
 the first prism comprises a first incident surface, a first reflective surface and a first exit surface, wherein the first incident surface faces an image side surface of the second lens; 
 the second lens group is with positive refractive power and comprises a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens, all of which are arranged in order from the first object side to the first image side along the first optical axis, wherein an object side surface of the third lens faces the first exit surface of the first prism and a refractive power of the third lens is opposite to a refractive power of the fifth lens; and 
 the third lens and the fifth lens satisfy: 37≤Vd 3 −Vd 5 ≤50, wherein Vd 3  is an Abbe number of the third lens and Vd 5  is an Abbe number of the fifth lens. 
 
     
     
       12. The panoramic lens assembly as claimed in  claim 11 , wherein the seventh lens is an aspheric lens and a sign of the refractive power of the third, fourth, fifth, sixth and seventh lens is positive, positive, negative, positive and positive. 
     
     
       13. The panoramic lens assembly as claimed in  claim 11 , wherein the first lens assembly satisfies:
   −4≤ f   1   /R   12 ≤−0.667,
 
 wherein f 1  is an effective focal length of the first lens and R 12  is a radius of curvature of an image side surface of the first lens. 
 
     
     
       14. The panoramic lens assembly as claimed in  claim 11 , wherein the first lens assembly satisfies:
   4≤ ER   11   /f   f ≤8,
 
 wherein ER 11  is an effective radius of an object side surface of the first lens and f f  is an effective focal length of the first lens assembly. 
 
     
     
       15. The panoramic lens assembly as claimed in  claim 11 , wherein the first lens assembly further comprises a stop disposed between the third lens and the fourth lens. 
     
     
       16. The panoramic lens assembly as claimed in  claim 11 , further comprising a second lens assembly, wherein the second lens assembly comprises a third lens group, a second prism and a fourth lens group, all of which are arranged in order from a second object side to a second image side along a second optical axis, wherein:
 the third lens group is with negative refractive power and comprises an eighth lens with negative refractive power and a ninth lens with negative refractive power, all of which are arranged in order from the second object side to the second image side along the second optical axis; 
 the second prism comprises a second incident surface, a second reflective surface and a second exit surface, wherein the second incident surface faces an image side surface of the ninth lens; 
 the fourth lens group is with positive refractive power and comprises a tenth lens, an eleventh lens, a twelfth lens, a thirteenth lens and a fourteenth lens, all of which are arranged in order from the second object side to the second image side along the second optical axis, wherein an object side surface of the tenth lens faces the second exit surface of the second prism and a refractive power of the tenth lens is opposite to a refractive power of the twelfth lens; and 
 the first object side and the second object side are opposite to each other, the first image side and the second image side are opposite to each other. 
 
     
     
       17. The panoramic lens assembly as claimed in  claim 16 , wherein the second lens assembly satisfies:
   0.2≤ TTL   2 /θ 2m ≤0.4,
 
   37≤ Vd   10   −Vd   12 ≤50,
 
 wherein TTL 2  is an interval in mm from an object surface of the eighth lens to a second image plane along the second optical axis, θ 2m  is a half maximum field of view in degree for the second lens assembly, Vd 10  is an Abbe number of the tenth lens and Vd 12  is an Abbe number of the twelfth lens. 
 
     
     
       18. The panoramic lens assembly as claimed in  claim 16 , wherein the second lens assembly satisfies:
   −4≤ f   8   /R   82 ≤−0.667,
 
   4≤ ER   81   /f   s ≤8,
 
 wherein f 8  is an effective focal length of the eighth lens and R 82  is a radius of curvature of an image side surface of the eighth lens, ER 81  is an effective radius of an object side surface of the eighth lens and f s  is an effective focal length of the second lens assembly. 
 
     
     
       19. The panoramic lens assembly as claimed in  claim 16 , wherein the fourteenth lens is an aspheric lens and a sign of the refractive power of the tenth, eleventh, twelfth, thirteenth and fourteenth lens is positive, positive, negative, positive and positive. 
     
     
       20. The panoramic lens assembly as claimed in  claim 16 , wherein the second lens assembly further comprises a stop disposed between the tenth lens and the eleventh lens.